Both .ciw (Web of Science exports) and .enl (library) files are used by EndNote, so there may be a way how data can be transferred from one format to another. However, we couldn't reliably verify whenever this conversion is useful, or even actually possible.
Convert EndNote Web of Science export to Endnote library.
We found 3 software records in the database related to .ciw to .enl file format conversion.
Microsoft Windows software - convert ciw to enl on Windows
Search tool for online bibliographic databases
Convert from ciw file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned ciw to enl. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert ciw to enl on OS X
Application to organize bibliographies
Apple iOS (iPhone, iPad, iPod Touch devices) software - convert ciw to enl on iOS
App for iPad used to search in bibliographic databases